I use https://posteo.de/en and am very happy so far, it's 1 EUR per month.

Features for the curious:

- 2 GB email account

- 100% green electricity

- Saved data can be encrypted data

- Two-factor auth

- Ad-free

- Sign up without personal details

I'm not related with them in any way, just a customer. The only con is that you can't use your own domain.